Gregor's books and lectures are great. other people you might like is Dr. mcdougall, Dr Neil Barnard, Dr Thomas Campbell, Dr. Alona Pulde, Dr. Joel Fuhrman, and Dr. Douglas Graham. my favorite are the fuhrman and ultimate favorite is dr gragram. read alot of all of these guys books, listened to there audio lectures and even watched their videos as well. if you want some good references to more good stuff just let me know.
best of luck :)